/*
 * Created on Jan 18, 2006
 * Created by Alon Rohter
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */
package com.aelitis.azureus.core.networkmanager.impl;

import java.nio.ByteBuffer;

/**
 * 
 */
public class TransportCryptoManager {

    private static final TransportCryptoManager instance = new TransportCryptoManager();

    public static TransportCryptoManager getSingleton() {
        return instance;
    }

    public void manageCrypto(TransportHelper transport, byte[][] shared_secrets, boolean is_incoming, ByteBuffer initial_data,
            final HandshakeListener listener) {
        try {
            new ProtocolDecoderInitial(transport, shared_secrets, !is_incoming, initial_data, new ProtocolDecoderAdapter() {
                public int getMaximumPlainHeaderLength() {
                    return (listener.getMaximumPlainHeaderLength());
                }

                public int matchPlainHeader(ByteBuffer buffer) {
                    return (listener.matchPlainHeader(buffer));
                }

                public void gotSecret(byte[] session_secret) {
                    listener.gotSecret(session_secret);
                }

                public void decodeComplete(ProtocolDecoder decoder, ByteBuffer remaining_initial_data) {
                    listener.handshakeSuccess(decoder, remaining_initial_data);
                }

                public void decodeFailed(ProtocolDecoder decoder, Throwable cause) {
                    listener.handshakeFailure(cause);
                }
            });
        } catch (Throwable e) {

            listener.handshakeFailure(e);
        }

    }

    public interface HandshakeListener {
        public static final int MATCH_NONE = ProtocolDecoderAdapter.MATCH_NONE;
        public static final int MATCH_CRYPTO_NO_AUTO_FALLBACK = ProtocolDecoderAdapter.MATCH_CRYPTO_NO_AUTO_FALLBACK;
        public static final int MATCH_CRYPTO_AUTO_FALLBACK = ProtocolDecoderAdapter.MATCH_CRYPTO_AUTO_FALLBACK;

        public void handshakeSuccess(ProtocolDecoder decoder, ByteBuffer remaining_initial_data);

        public void handshakeFailure(Throwable failure_msg);

        public void gotSecret(byte[] session_secret);

        public int getMaximumPlainHeaderLength();

        public int matchPlainHeader(ByteBuffer buffer);
    }
}
